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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55c3d22108dffe75ed73393c266a784c45f4221619126401d904aadc69822dca' 
  AND token = '/Maryqn5xN0Iq6/O/45uEv3Pjcmt5DWcjnoAH6DtZ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}